UFCThe Ultimate Fighting Championship (UFC) is a U.S.-based mixed martial arts organization, recognized as the largest MMA promotion in the world. The UFC is headquartered in Las Vegas, Nevada and is owned and operated by Zuffa, LLC. This promotion is responsible for solidifying the sport's postion in the history-books.
UFC is currently undergoing a remarkable surge in popularity, along with greater mainstream media coverage. UFC programming can now be seen on FOX, FX, and FUEL TV in the United States, as well as in 35 other countries worldwide.

I am aware it was a short notice fight and the UFC didn't have better options and much respect to both guys, but when was the last time two debuting fighters in the UFC fought in the main event?
did that ever happen before? or was that a monumental event that will probably not be repeated in the future?

p.s. exclude tuf finals due to them coming from a reality show, and the women's main event.

I think he wanted to know if 2 fighters making their debut have ever fought against each other in the main event - not just 1. So I think excluding TUF fighters and Rousey and Carmouche that was the first time that 2 people have had their first fight as a main event

somebody please rep this John guy for me. I cant without spreading some around first. he pwnd this thread.

That's interesting, considering that it did not answer the question of the OP, which was both fighters making their UFC debuts.
However, I would rep him if I could considering he brought some interesting information